Exhaust-silencer.



G. U. PALMER;

- EXHAUST SILBNGER. ArP'LIoATIoN- rxLnn FEB, 1,r 1911.

Patented May 30, 1911.

, Unrrnp sTATEs PATENT oruion.

GEORGE CARL PLMER, OF STANFORD, CONNECTICUT, ASSIGNOR OF ONE-THIRD T0 JOSEPH E. FARRELL, JR., OF S'Ill-UVIFORLD,ACONNECIICUT.

EXHAUST-SILENCER.

Specification of Letters Patent.

'Patent-ea May s i 911.

Application filed February 1, 1911. Serial No. 605,962.

dent ot Stamford, county of Fairtield, and

State of Conneetieut, have invented a new and useful'Improvement in Exhaust-Si- .leneers, of which the following is a full,

clear, and exact. specification, reference being had to the accompanying drawing wlie'rein Figure l. is a sectional view on line L-l indicated in Fig. 2; F ig. 2 a sec-.tional View on line "2f-2 indieated in Fig. l; Fig. 3 a.

side elevation of the pangland Fig. 4i a de- 'ail view ot the hollow shaft and of the tan blades niounted thereon.

My invention relates more particularly to internal Combustion engines and consists of the.v improved exhaust silencer, or niuttler, as the): are sometimes called,'hereinafter more tally described and speeied in the elaiins, into 'which the exhaustgases troni the working cylinder ot suoli an engine are discharged and by ineans -ot which the eX- .haust gases are practically noiselessly expanded, and the noise, produced by the eX- haust, dissipated without obstructing or resis-ting their exhaust, and without ereatlng any back pressure upon the exhaust valve of the engine, and whereby the exhaust is assisted, the gases being drawn out and practically noiselessly expelled.

This improved exhaust silencer comprises the easing-c2, preteraliily Circular in shape, a vcorrespondingly shaped pan d, set in the easing coneentrieally therewith, being supported on studs f and secured in its place by screws f, screwed through its bottoni into the studs f. The heads of these screws are eountersunlr in the bottoni of thel pan d, so thatl its interior is smooth and even. lnstead of thus fixing the pan within thek eas ing, the pan may be .serewed onto the @over in the saine'way as the cover 7) is secured to the riin of the casing by the screws C. It is, however, preferable, and more eon venient for the purpose of assembling the parts, to seeurethe pan to the bottoni ofthe easing upon the studs f, as hereinbetoreex plained.

The riin of the pan d is perforated, the perforations 27 extending, in the arrangenient shown in Fig. 3,`roni near the inlet pipe m, and gradually increasing in size, for about tivo-thirds or ve-sevenths of the cir .closed center of the bottom oi. the pan, and in euniterenee of the pan, to about where the extension ot the axis oit kthe inlet pipo m would .strike the riin of the' pau, where `the perfor-ations are largest. .'l"he rim ot' the pan adjoins closely the inner surface ot the @over I), whereby casing a and pan /Z are By this cover l), secured upon the rini of the casing by screws c, also the space p between the pan (l and the interior of easing a is inclosed. The discharge pipe u is preferably Cast in one piece with the cover and turned to divert the flow of the gases; it is, however, not essential tothe operation of the silencer as desi; ied.

An inlet into the interior space of the pan l is provided in the riin of t e pan, and pipe m, set therein, extends through the riin of the casing, its projecting end being 4tlanged or otherwise adapted for attaching the silencer to the exhaust pipe of the e`ngine. Circular openings are inado in the the center of the cover ZJ, wherein the ends ot the hollow shaft g are fitted. Cou'eentrically with the central opening in the bottoni oit the pan, a boss is cast on the outside of the easing a, wherein a screw-threaded hole z. is made, and the screw u, having a conical and hardenedpoint u', is .serewed in and secured in its adjusted position by the screwni'it u2. The'hollow shaft g is rotatably snpported on screws u and o. eorresponii ingly screw-threaded bore is 'drilled in the boss yw, east on the wall ot the discharge pipe n, and screw o, pointed and hardened like the screw u, is screwed in and locked in its adjusted position by serewaiut v in the saine manner, and the shaft'gbeing provided on its endswitlh spiders g and g2, having correspondingl'y shaped depressions in their Centers into which the points of the screws u and o enter. Spider g is formed' of iiat Cross-bars, set. flush with the end of the shaftl g, the` arins of spiderg2 `project outwardly.

yBlades la, k', k2 and o3 are secured to the hollow shaft g, as shown in Fig. t, and snugly fitted into the pan. They reach closely to the interior of the rim of thel pan d and their Width is nearly equal to its depth,

only a alight clearance being allowed between t-heln and the bottom of the pan and the cover 7) ofthe casing. When the eX- haust gases from the engine are discharged. they enter through the inlet pipe m into the erts in turn a u, ctc., cause; the hollow shaft g to rotate in.

the direction of the arrow indicated in Fig. 2, their force being exerted upon the blades 1.'. k', etc., thus driving thesliaft g. As the shaft rotates', the blades, moving with it` permit and drive the exhaust gases through the perforations i into the space p, between the rim of the pan and-the 'easing a, each blade progressing in the same direction, ex-

pressure upon the exhaust ses before assisting in their escape from e pan. Thespace p in the casing' between the rim of the pan and the outer wall of the casing, communicates through the hollow shaft g with the outlet pipe n, and there is, consequently, no resistance to' the expansion of the exhaust gases in the pan and to their outflow. Accordingly, they escape rapidly and silently through the erforations ya' into the space p and through s aft g and the dis.- charge pipe n into the atmosphere, and there is no other noise produced except the slight buzzing of the blades as the hollow shaft g rapidly vrotates.- -lt vshould be understood that in practical operation ofl the silencer, the shaft g rotates continuously, the exhaust gases entering it-,in rapidly .following puffs,

with each opening of the exhaust valve of the engine. Then the action of the blades le, la', cand k3 becomes to be practically that of an exhaust fan, and consequently, instead ofthe're being a resistance to the entry of the exhaust gases into the pan, there is rapidly developed a partial vacuum therein,

'and the., gases are drawn in, ex and freely and immediately upon entering t e pan, and are being continuously driven out. My improved exhaust silencer requires to beof comparatively small size, 6, 8, and 10 inches in diameter and not over two inches wide. Its parts may be produced of thin castings or pressed out of sheet metal; one of ten inches in diameter being suflicient to dispose of the exhaust of an internal coinbustion engine, of such capacity as is used on automobiles or boats. It is easily and rapidly applied or affixed to the exhaust pipe of any engine and does not require any care whatever.

I claim as my invention: Y i

l. A silencer for the exhaust of an engine, comprising a casing; a circular pan, smaller than the vcasing and provided with perforations in its side wall, and with 'a circular opening located centrall)7 in its bottom, se-

cured concentrically intheV some distance from its bottom; a cover or the casing, having a circular o mg, in

alinemen't with the circu ar opening' in the" and adapted to beconnected to the4 exhaust.

pipe of the engine. X

2. A silencer for the' exhaust of an engine,

shaft; an inlet into the pan comprising a cylindrical casin acorre- Y spondingly shaped pan, but sh lower and cfa smaller diameter, secured conoentiically therein some distance from the bottom of the casing, and having a series of perforations in its rim and a circular opening in its bottom; a cover secured to the casing, having a circular opening, located in alinement with the circular openings of the pan; an outlet pipe, connecting with `the opening in the cover; a hollow shaf set in the circular openings of the pan Aand of the cover, and means `for rotatably su porting the shaft; a series of blades secured) to the shaft; an inlet into the pan anda pipe connected thereto throu h the casing and adspted to be conneete to the exhaust pipe o the engine.

3. A silencer for the exhaust of an engine,

comprising a casing; a circular an, smaller means for rotatably su porting the shaft; ay

series of blades secure to the shaft and extending to therim of the pan and laterally from the bottom of-the pan to theinner face of the cover; an inlet into the pan and a pipe connected .thereto through the casing and adapted to be connected to the exhaust pipe of the engine.

GEORGE CARL PALMER.

lllitnesses: p

J Aims E. Bnixcxraiiorr,

Louis J. Cumis.

cwi "t thi* Patent may be obtained for ave cents each, by addressing the "Commissioner of Patents,

' Washington, D. C." 

